Capture perfect portrait shots with the Sigma 28mm F1.4 Art DG HSM Lens. You can fit the lens on to Nikon FX-format cameras. The lens uses 17 elements in 12 groups. There are three SLD two FLD and three aspherical elements to combat various anomalies throughout the focus range. The application of the super multi-layer coating ensures clarity and image saturation by minimizing unwanted reflections. An additional protective coat is applied on the front element to repel moisture and dust. With the hypersonic autofocus system the lens ensures a smooth and silent AF performance. Use the manual override to critically focus on an object. The rounded 9-blade diaphragm creates smooth bokeh that complements the shallow depth of field made by the maximum aperture of f1.4. Thanks to the weather-sealed construction the lens can work in inclement conditions. You can adjust the focus parameters or update the lens39 firmware with an optional Sigma USB Dock.